<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>关于defineProperty</title>
</head>
<body>
    <script>
        let person = {
            name:'涵公子',
            sex:'男'
        }
        Object.defineProperty(person,'age',{
            value:18
        })

        console.log(person);
    </script>
</body>
</html>